A rough drawing made absentmindedly. During the long meeting, she filled the margins of her notebook with doodles.
A design, pattern, or scribble made while thinking or when bored. His notebook was full of intricate doodles that he drew during lectures.
An absent-minded or silly person; a fool (archaic). Back in school, they called him a doodle for never paying attention.
A temporary decorative version of the Google logo displayed to commemorate a particular event or anniversary. The Google homepage featured a doodle honoring the lunar landing.